2001: A Space Odyssey is one of mine. It's hard to believe that movie was made without computers. Even the display monitors seen on the ships were rear projected and used traditional animation for their motion graphics.

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John Carpenter's The Thing stands out for me. This might be saying a lot but it doesn't get much more rough and raw (not to mention out right terrifying) than what was created for that movie. I had nightmares for years after watching that one!